Clinical lectures on the principles and practice of medicine . very case. The expansibility of the lungs, and the amount of air expelled fromthe chest after full inspiration, may also be measured by the spirometerof Mr. Hutchinson. But the necessity of determining the height andweight of the individual, of teaching him how to inspire and expire, ofpaying attention to the muscular force and other circumstances, so interrferes with the correct conclusions to be derived from this mode of ex-ploration, as to render it valueless in the examination of cases gene-rally. As a means of physiological re
Clinical lectures on the principles and practice of medicine . very case. The expansibility of the lungs, and the amount of air expelled fromthe chest after full inspiration, may also be measured by the spirometerof Mr. Hutchinson. But the necessity of determining the height andweight of the individual, of teaching him how to inspire and expire, ofpaying attention to the muscular force and other circumstances, so interrferes with the correct conclusions to be derived from this mode of ex-ploration, as to render it valueless in the examination of cases gene-rally. As a means of physiological research in determining the vitalcapacity of the chest, Mr. Hutchinsons investigations are of the utmostimportance. Dr. Scott Alison has invented an instrument for measuring the an-gles of the chest. It will also enable us to judge approximatively of thecurves under various altered conditions. He calls it stetho-goniometer,a term derived from three Greek words, signifying chest, angle, andmeasure. Dr. S. Alison believes that it will afford data not to be ob- b. Pig. 23 obtained by other means, and assist in the diagnosis of disease in itsearly as well as in its later stages.* PERCUSSION. The object of percussion is to ascertain the resistance and size of organs. It may be practiseddirectly, or through the me-dium of an interposed body(mediate percussion) — thelast being the only satisfac-tory way. Without knowinghow to strike, and to produceclear tones, we can never edu*cate the ear, or the sense ofresistance. This preliminary
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectmedicine, bookyear187
